MEMPHIS, Tenn. (AP) — Health officials have confirmed the first human case of West Nile virus in Shelby County this year.

The Shelby County Health Department said Monday that a 74-year-old man has contracted the mosquito-borne disease. The department says his is the second case of West Nile virus to be reported this year in Tennessee.

Humans become infected by mosquito bites. Severe symptoms occur in about one in 150 people, according to the Centers for Disease Control and Prevention.